Electrical resistance-board.



14 664,953. Patented Jan. I, won.

- w. B. KING.

ELECTRICAL RESISTANCE BOARD.

(Application filed July 21, 1900.)

3 Shaets-Sheet I.

(No Model.)

Fifi? INVENTOR WELLES R KENG, Q?

BY git/k g ATTOR N WITNESSES No. 664,953. Patented in mm.

W. R. KING.

ELECTRICAL RESISTANCE BOARD.

' Y (Appficltion filed July 21. 1900.1,

(No Model.) 3 Sheets-Shoat 2,

WITNESSES:

w- 1MM WG-5 WHLHSRKHNC,

THE ECKERY LITROGmPfilNG o0, WASmTON. D. C

No. 664,953. I Patented Jan. I, I901,

; w. n. KING. v

ELECTRICAL RESISTANCE BOARD.

(Ayplluflon am m 21, 1900., I (No Model.) 3 Shuts-8hoet 3.

WITNESSES 55 INVENTOR I WB LIS RKHNQ qUNITED STATES PATENT OFFICE.

WILLIS KING, OF NEWARK, NEW JERSEY, ASS IGNOR. TO'THE HANSONISZJ 3 VA-N WINKLE COMPANY, OF NEW JERSEY.

ELECTRICAL RESISTANCE-BOARD.

SPECIFICATION forming part of Letters Patent N 0. 664,953, dated January 1, 19 01.

. Application illad July 21,- 1900- To all whom it may"conc'crn: Be it known-thatI, WILLIS R. Emma citi, zen of the UnitedStates, residing at Newarkin the county of. Essex-and State ofNew J er- 5 sey,have inventedcertain new and useful Improvements in. ElectricalResistance-Boards; and I do hereby declarethe following to be a full cleanand exact description of the inventiom such as will enable others skilled in use ,the same, reference being had to theac-l coin panying drawings, and to numerals of reference-marked thereon, whichform a part of this specification.- 1' I This invention has reference to improvemerits in electrical. resistance-boards to be employed in connection with dynamo-electric machines and 'forvariousv other electrical purposes and which are intended'for regu lating the intensity of the electriccu rrent.

My present invention has fol. its principal objects, first, to provides circular orother' suitably-shaped resistance-board of a large range having electricizllydivisible resistances, preferably in the form of coils, made independently of and separable from suitable receiving-sockets or other holding means with which the resistances are connected; second, to provide a. novel construction which will admit of making'the combined electrical sections of the resistance-coils mechanically in one or more pieces for the purpose qr form-- ing more perfect electrical conn-ectionsand resistances of the parts when. more than one section is-used; third, to form a pivot-support of the switch-armintegrally with one of the insulatedcontact-making segments of the ,board, and, finally, to provide a novel construction ofelectrical resistanceboard which 40 shallbe of a simple construction and ti; provide a device'of thecharacter hereinafter set forth in which the-resistance capacity of the mechanism. is very easily and quickly changed by varying the diameters and lengthening or shortening-the .resistance coils ,or by varying the material of the resistances, and furthermore, by increasing or decreasingthe bum; ber'of resistances or cells, all of which will be morefully sotforth in thcaccon 'panying 5o description of my invention. t

This invention therefore consists in the theart'to which it appertains to make and ing of the said table or base 1.

Boris 1N0. 24,416. iNo model.)

of .whichwill be fully set forth in the accompanying specification, and then finally embodied in the clauses 0f the claim.

The invention is clearly illustrated in the accompanying drawings, in which- Figure 1 is a plan or top view of one form of electrical resistance-board embodying the principles of my invention, and Fig. 2 is a front edge view of the same. Fig. 3 isa vertical section of the said device,'taken on line 3 3 in said Fig. 1. Fig.4is a bottom view of the same, and Fig. 51s a. vertical cross-section taken on line 5 .5 in said Fig. 1. Fig. 6

is a plan'or top-view of an electrical resistance-board of a modified form of construc- 70. tion, but still embodying the principal elements of this invention; andl ig. 7 is a crosssection of the same, taken on line 7 '1" in said Fig. 6. I c

Similar numerals of refereuce'are employed 7 5 in all of the said'above-described views to indicate corresponding parts.

In the said drawings in Figs. 1 to'5, inelw si've, 1 indicates the main table or base, whichm'ay be circular in outline, but may be of any other preferred shape, and is preferably provided with the leg portions or a surrounding flange 2, in which there are holes or openings 3 for-the reception ofscrews or other suit-- ablemeans' forseeuring the device in position. Thesaid table or base has a central cpeningin which is arranged a central stud or post 4, rotatively placed in an insulating collar or sleeve 5in said central hole or open-- Against the 0 nnder surface of the main table or, base 1 have snitablysecureda dish or plate 6 oi an insnlat s; ,inaterial, and upon its upanotherdisl: or plate 7, also made of insmating material. Suitably se- 5 cured upon the upper insulating disk or plate.

'7, preferably by means of screws 8, which, as.

will. be seen from Fig; 5, pass through the two insulating-disks (iand 7 and through the main body table or'base lot the device, but which too are insulated therefrom by means of the sleeves or collars 9, is a circular metallic consocket the end of one of the electrical main wires in which the electrical resistance-board is to be placed in circuit. The said central stud or post 4, hereinabove mentioned, is socurely held in position by means oi an enlargement lhforming a partof said post,

resting upon the'insulated disk 7, and a nut 17, screwed upon the lower screw-threaded end portion 18 of the said post, substantially as illustrated in Figs. Sand 5. The said post l is also provided above the said portion 1a with a cylindrichl part 15, which is arranged in a hole 20 in acontact-making switch-lever 19 and is rotatively arranged upon the parts 14; and said portion 15, as will be clearly seen. The said switch-lever is properly held in place, so as to cause its contact-surfaces 21 and 2.2 to make proper sliding contact, as hereinafter more fully set forth, by .a suitably-constructed spring-plate and a nut 24, screwed down upon the screw end 16 of the poster stud 4, so as to compel the free ends of the said spring-plate to exert snflieient pressure against the upper surface of the switch-lever 1.) and to make the proper electrical contact of its parts with the ring 10 and certain series of metallic section-blocks or contact-scctions 95, which are arranged i'n"-' a circle around the said ring 10,.but are separated from said ring by a space 26, and are also separated from themselves by radiating upper surface of said ring when turned by means of the finger-piece or handle 28 while in its initial position. \Vhen there is no current passing through the device, its part 22 rests upon the upper surface of the segmental projection 11; but when the lever is moved then the said part 22 can be brought in electrical contact with any one of the said metallic section-blocks or contact-segments 25 to establish an electrical circuit through the sew eral parts of the device in the manner to be presently described,

The blocks or segments, of which there may be any desirable number, according to the size of the apparatus and the purposes to which it is to be put, are separated from each other, as stated, by small intervening spaces 27 and are secured to the non-conducting disk or plate 7 by means of screws 29, which are insulated from the table or base 1 by the insulating collars or sleeves 30. Radiating from each of the said segments or blocks 25 is a socket 231, and attached to and extending from or near the outer extremity of each socket to the next adjoining socket- 81 of the adjacent b1ock25 and secured in said sockets by means of the screws are the ends 33 of able resistance 34. All oi the sockets iii are what may be termed double sockets for receiving the respective ends of the adjacent coils; but the two end sections of blocks 25 are provided with single sockets 81, since in these sockets are arranged but one end of the first and last resistance-coils, as will be clearly evident from an inspection of Fig. l of the drawings. The last block or segment 25 is also provided with a radially-arranged projection 35, which has a socket 36 and setscrews 37 for securing in said socket theend of the other electric main wire in which the electrical resistance-board is placed in circuit.

Having thus described the construction of my invention represented in Figs. 1 to 5, inclusive, its operation is as follows: The socket-ed portions 11 and of the ring 10 and last section or block 25, respectively, having been connected by means of the main electric wires in the ordinary manner with any source of electricity a complete circuit will be establishedthrough the apparatus hereinabove described. 'lhe switch-arm 19, as will be evident, can be turned in any desired position, whereby contact is produced bet. ween the ring 10 and any one of the blocks and in consequence thereof any one or more resistancecoils 34E can be cut in or out of the main circult, as will be clearly evident from an inspection of the several iign res of the drawings. From an inspection of Fig. 1 it will be seen that the diameters of the various resistancecoils may be varied, whereby the resistance capacity of this mechanism is very easily and cheaply changed to meet the conditions existing for different work with which the resistance-board is to be used. it will also be evident. that the number of sections or blocks 25 and the sockets connected therewith may be changed by adding to or taking away from the number of blocks herein shown without changing the nature of my invention, and the material of which the resistances are made may be varied, if desired.

in lieu of the arrangement and construction of the several parts just described in connection with said Figs. 1 to 5, inclusive, I may employ the form of resistance-boari'l represented in Figs. (3 and 7 of the drawings. In this construction the base'is indicated by the referencenumber 38, and it is made of insulated iron, slate, or marble or any other suitable material, and 39 represents a series of metallic section blocks or segments which are disposed in a circle and are secured upon said base by means of screws 40, being held in position by nuts 41 on the under side of the base, as shown in Fig. 7. Radiating from each block 39 is a socket 42, attached to and extending from or near the outercxtrcmity of each block to the next adjoining block, and the said sockets are connected by means of the resistance-coils 43, as and in the manner hereinabove set forth, and are preferably held in place by means ol'set-serews l3. These a scctimi-coil of reeistance-wire'or othersuitcoils connect all the several blocks 39 except e of mypresentinvention.

the block 39' and the block 39", to the latter of which is secured, by means of a bolt 44 and a nut 45, a socketdfi for the end of one of the main electric 'wires in which the said resistance-board to be connected in circuit. Between the first segment 39' and the last segment 3!) is a segment 47, which has a forwardl'y-extending portion 48, to which is secured, by means of' a bolt 49 and nut 50, a socket 51 for the reception of the end of the other main electric wire in which the device is to be arranged in circuit. The said segment or block 47 is also provided with an inwardly extending portion 52 and has central stud portions 53 and 54, as illustrated in Fig. 7. The portion 53 is arranged in a central hole and is insulated therefrom by means of a washer 56 of a non-conducting material, and rotatively secured upon the part 54 by means of a nut 57 or in any other suitable manner is a switch-lever 58, provided with a finger-piece or handle 59. Said lever in this case is provided with suitable contact brush or brushes 60, which are suitably secured to said lever by means of a screw or screws 61 and can be brought in electrical contact with any one of the said segments or blocks 39. or 39 or 397., In this manner a complete circuit can be established through the socket 51 with the block 47 and its inwardly-extending portion 52 with they stud 54: and then by means of the lever 58 and the brush or brushes 60 with any one of the blocks 39'to cut in or out one or more of the resistance-coils 3% or other resistance mate-rial employed in the manner hereinabove described in connection with the constructionrepresented in said Figs. 1 to 5, inclusive. It will also be evident that in the form of resistance-board represented in said Figs. 6 and 7 any number of such blocks or segments 39 may be employed, and it will be further observed that'the resistance capacity of this mechanism may be changed by varying the diameters of the coils or by lengthening-or shortening the resistance-coils, which are inserted in the sockets in the outer faces of the segments or blocks, and the material of which the resistances are made may also be varied at will. 7,

I am fully aware that changes may be made in the several arrangements and combinations of the parts without departing fro m the scope Hence I do not my invention to the exact arrangements and com bin-ations of the parts as herein described, andillustrated in the accompanyingdrawings, nor do I confine myself to the exact details of the construction of the said parts.

Having thus described my invention, what I claim is i '1. A resistance-board, comprising an arrangement of segments or blocks, h intervening spaces between them, a non-conducting support on which saic segments or blocks are arranged, an outWai-dlyprojecticg socket on each segment or block, a sectional resistance-coil provided with free end pertions arranged in the adjacent sockets of said segments or blocks, so as to connect two adjacent sockets, and a centrally arranged and pivoted switch-lever, adapted to make elec-' thereto, disposed in a circle around a common.

center, sockets extending radially from said segments or blocks, and resistance material or coils, integrally separate trom and removably connected with said sockets, in combination, with a centrally-pivoted switch arm or lever arranged to make electrical contact with either one of the said segments or blocks, substantially as and for the purposes set forth.

3. A resistance-board, comprising a noncondncting base, segments or blocks secured thereto, disposed in a circle around a common center, sockets extending radially from said segments or blocks, and one or'more helical resistance-coils, integrally separate from and removably connected with said sockets, in combination, with a centrally-pivoted switch arm or lever, electrically connected at its one end with the main circuit, and adapted to make electrical contact at its other end with either ofsaid segments or blocks, substantially as and for the purposes set forth.

1. A resistance-board, comprising anonconduc'ting base, segments or blocks secured thereto, disposed in a circle around a common IOO center, centrally-arranged vertical. post in said sockets, in combination, with a centrallypivoted switch arm or lever, electrically connected atits one end-with the main circuit, anti adapted to make electricalcontact at its other end with either of said segments or hlocks,a not placed upon the screw end of said vertical post, and an expansible spring on said post between the said nut and said switch-lever, substantially as and for the purposes set forth.

5. resistance-board, comprising ncnconducting case, segments orhlochs secured theretc, disposed in a circle around a common center and one of said segments being extended toward the center, sockets extending from saidsegments, and resistance material crcoils. integrally separate from and removahly connected with said sockets, in combination, with switch arm or lever, electrically connected at one cf its ends with the ircnit, and'adapted to rnalre electrical contact at other end with either of segments, substantially and for purposes set 6. l resistance-board, comprising a noncond base, segments or blacks secured thereto, disposed in a circle around a common contact at its other eml with either of salt-l segeentter and one of snitl segments bein exments, substantially as and for the purposes tended town-rd the eenter, sockets extending, set; forth. radially from said segments, and resistance- In testimony than I claim the invention setcoils integrally separate from and l'GlllOViLbl)" forth above I have hereunto set my lnnnl this connected with snitl sockets, said coils being 19th day of July, M00. of varying dimnelers and varying lengths, in \VILLIS R. KING.

. combination, with a switch arm or lever, electrically connected at one of its ends with the 10 main circuit, and adapted to make electrical 1 Witnesses:

FREDK. (3. l ni-xnn'rznh, A. VAN Wnnuna. 

